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Lecture 01. Strong Models Don't Mean Reliable Execution | Learn Harness Engineering

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A project-based course on designing the environments, state, verification, and control systems that make Codex and Claude Code reliable.

Lecture 01. Strong Models Don't Mean Reliable Execution | Learn Harness Engineering Skip to content Menu Return to top 中文版 → Code examples: code/ Practice project: Project 01. Prompt-Only vs. Rules-First: How Much Difference Does a Harness Make Lecture 01. Strong Models Don't Mean Reliable Execution ​ As of late 2025, the strongest coding agents on SWE-bench Verified achieve roughly a 50-60% pass rate. That number sounds decent at first glance — but don't celebrate just yet. Those are carefully selected tasks with clear issue descriptions and ready-made test cases. Hand the agent your everyday

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